Postal convention between Germany and Australian colonies, 1872-07-20 Unit ID: 138/416-18 Date: 1872-07-20
Postal Convention between New Zealand and United States, 1870-12-20 Unit ID: 136/189 Date: 1870-12-20
Postal convention between Tasmania and United States, 1879-10-15 Unit ID: 152/270-71 Date: 1879-10-15